I put these files in revision control aswell. But in case I wouldn't be able to, I'd postfix it with a timestamp: product-demo-20100922-1050.ppt If that's too

I put these files in revision control aswell. But in case I wouldn't be able to, I'd postfix it with a timestamp: product-demo-20100922-1050.ppt If that's too verbose, then product-demo-20100922-N.ppt, where N is an arbitrary, but increasing number as I save different versions. But a proper revision control system would be much more valuable, even for non-text data.